Built-in permanent magnet rotor punching sheet capable of improving utilization rate of permanent magnet

Abstract

The utility model discloses a built-in permanent magnet rotor punching sheet capable of improving the utilization rate of a permanent magnet, which comprises a sheet body, the sheet body is provided with a magnet installation structure, and the magnet installation structure comprises a first magnet installation groove, two second magnet installation grooves, two first magnetic isolation grooves and two second magnetic isolation grooves which are arranged on the sheet body. The two second magnet mounting grooves are located in the same side of the first magnet mounting groove, the two second magnet mounting grooves are symmetrically arranged with the first magnet mounting groove as the center, the second magnet mounting grooves are obliquely arranged, and the ends, close to the center of the sheet body, of the second magnet mounting grooves are obliquely arranged in the direction close to the first mounting groove. The beneficial effects of the utility model are that the guide magnetic circuit extends along the gap between the first magnetic isolation groove and the second magnetic isolation groove, thereby reducing the eddy current loss generated in the rotor punching sheet, reducing the radial magnetic force, and achieving the advantage of small eddy current loss of the permanent magnet.

Description

Technical Field

[0001] The utility model relates to the technical field of motor rotor punching sheet structures, in particular to a built-in permanent magnet rotor punching sheet capable of improving the utilization rate of permanent magnets. Background Art

[0002] my country is vigorously developing new energy vehicles, setting the dual goals of energy conservation and emission reduction, achieving carbon peak, and achieving carbon neutrality. This has led to rapid growth in new energy products in the automotive market. New energy vehicles include pure electric vehicles, fuel cell electric vehicles, and hybrid electric vehicles. Hybrid electric vehicles are a potent combination of traditional internal combustion engine vehicles and electric vehicles. By combining the advantages of both, they significantly reduce fuel consumption while maintaining drivability, making them highly competitive in the market. Hybrid electric vehicles require motors with high power density, high efficiency, and excellent dynamic performance, all while maintaining low cost.

[0003] The motor consists of two parts: the rotor and the stator. The motor rotor is the rotating part in the motor. The rotor is equipped with an iron core, and the permanent magnet is embedded in the iron core. The iron core is assembled by overlapping multiple rotor punchings. The magnetic field generated by the stator coil when it is energized drives the permanent magnet and the iron core to rotate, thereby driving the rotor to rotate in the motor.

[0004] The Chinese invention patent with announcement number CN109412300B discloses a tangential motor, a motor rotor, and a rotor core. The rotor core is provided with a plurality of permanent magnet slots spaced apart along its circumference. The rotor core has rotor poles located between two adjacent permanent magnet slots. The rotor poles are provided with a first magnetic isolation hole and a second magnetic isolation hole. The first magnetic isolation hole is located on the radial centerline of the rotor pole to reduce the magnetic flux in areas where the magnetic flux is more concentrated and to even out the magnetic flux of the rotor pole as a whole. At the same time, the width of the first magnetic isolation hole gradually increases from the outside to the inside to increase the magnetic resistance in areas where the magnetic poles are more concentrated inside the rotor poles, so that the magnetic flux at the radial centerline of the rotor poles is evenly dispersed. In addition, the second magnetic isolation holes are distributed on both sides of the first magnetic isolation hole along the circumference of the rotor core. The second magnetic isolation holes cooperate with the first magnetic isolation holes to further even out the magnetic flux on the rotor poles and improve the direction of the magnetic flux. This comprehensively improves the waveform of the air gap magnetic density, reduces the proportion of harmonics, and reduces motor vibration and noise.

[0005] The existing motor rotor lamination structure is simple, the reluctance torque utilization rate is low, and eddy current loss is easily generated in the rotor lamination, which increases the radial magnetic force and affects the working performance of the motor. Therefore, the existing technology has the technical problem of high eddy current loss of permanent magnets. Utility Model Content

[0006] In order to solve the above technical problems, the purpose of the present invention is to provide a built-in permanent magnet rotor punching that improves the utilization rate of permanent magnets, which includes a sheet body. The built-in permanent magnet rotor punching that improves the utilization rate of permanent magnets has the advantage of low eddy current loss of permanent magnets.

[0007] In order to achieve the above-mentioned purpose of the utility model, the technical solution adopted by the utility model is as follows:

[0008] A built-in permanent magnet rotor punching sheet for improving the utilization rate of permanent magnets includes a sheet body, the sheet body is provided with a magnet mounting structure, the magnet mounting structure includes a first magnet mounting slot and two second magnet mounting slots, two first magnetic isolation slots and two second magnetic isolation slots located on the sheet body, the two second magnet mounting slots are located on the same side of the first magnet mounting slot, the two second magnet mounting slots are symmetrically arranged with the first magnet mounting slot as the center, the second magnet mounting slot is tilted, and the end of the second magnet mounting slot close to the center position of the sheet body is tilted in the direction close to the first mounting slot, the first magnetic isolation slot and the second magnetic isolation slot are respectively connected to the two ends of the second magnet mounting slot, and the first magnetic isolation slot and the second magnetic isolation slot respectively correspond one-to-one with the second magnet mounting slot.

[0009] Through such an arrangement: the first permanent magnet and the second permanent magnet are respectively installed in the first magnet mounting groove and the second magnet mounting groove, and the magnetic poles of the first permanent magnet and the second permanent magnet are arranged relative to each other, so that the first permanent magnet and the second permanent magnet attract each other on the sheet body, thereby being able to guide the magnetic circuit to pass through the first permanent magnet and the second permanent magnet in sequence. The dispersedly arranged first permanent magnet and the second permanent magnet can guide the magnetic circuit to extend along the gap between the first magnetic isolation groove and the second magnetic isolation groove at different positions, thereby reducing the eddy current loss generated in the rotor punching, reducing the radial magnetic force, and achieving the advantage of low eddy current loss of the permanent magnet.

[0010] Preferably, the first magnetic isolation groove is located at one end of the second magnet mounting groove close to the center of the sheet body, and the first magnetic isolation groove extends toward the center of the sheet body.

[0011] By means of such an arrangement, eddy current loss generated at one end of the second magnet installation slot close to the center of the sheet body is reduced.

[0012] Preferably, the second magnetic isolation groove is located at one end of the second magnet mounting groove away from the center of the sheet body, and the second magnetic isolation groove extends along the circumference of the sheet body.

[0013] Through such an arrangement, the leakage magnetic field can be reduced.

[0014] Preferably, the magnet mounting structure further includes two first auxiliary grooves provided on the sheet body, the two first auxiliary grooves are respectively located at both ends of the first magnet mounting groove, and the two first auxiliary grooves are symmetrically arranged with the first magnet mounting groove as the center.

[0015] Through such an arrangement, the leakage magnetic field can be reduced.

[0016] Preferably, the magnet mounting structure also includes two second auxiliary grooves arranged on the sheet body and two third auxiliary grooves arranged on the sheet body, the first auxiliary grooves, the second auxiliary grooves and the third auxiliary grooves correspond to each other one by one, the second auxiliary grooves are located on the side of the first auxiliary groove away from the first magnet mounting groove, the third auxiliary grooves are located on the side of the second auxiliary groove away from the first magnet mounting groove, and the second auxiliary grooves are staggered with the connecting line between the first auxiliary groove and the third auxiliary grooves.

[0017] Through such an arrangement, the leakage magnetic field can be reduced.

[0018] Preferably, a plurality of the magnet mounting structures are provided, and the plurality of magnet mounting structures are evenly distributed circumferentially on the sheet.

[0019] Through such a setting: Improve motor performance.

[0020] Preferably, the sheet body is provided with a plurality of first radial magnetic isolation grooves, wherein the first radial magnetic isolation grooves are located between adjacent magnet mounting structures, and the first radial magnetic isolation grooves extend in a direction close to the center position of the sheet body.

[0021] Through such an arrangement, the leakage magnetic field is reduced, thereby achieving the advantage of small eddy current loss of the permanent magnet.

[0022] Preferably, the sheet body is provided with a plurality of internal magnetic isolation grooves, and the plurality of internal magnetic isolation grooves correspond one-to-one to the plurality of first radial magnetic isolation grooves. The internal magnetic isolation grooves are located at one end of the first radial magnetic isolation grooves close to the center position of the sheet body. The internal magnetic isolation grooves are triangular as a whole, and the width of the internal magnetic isolation grooves gradually increases along the direction close to the center position of the sheet body.

[0023] Through such an arrangement, the leakage magnetic field is reduced, thereby achieving the advantage of small eddy current loss of the permanent magnet.

[0024] Preferably, the sheet body is provided with a plurality of second radial magnetic isolation grooves, the plurality of second radial magnetic isolation grooves are respectively located between a plurality of adjacent inner magnetic isolation grooves, and the second radial magnetic isolation grooves extend toward the center of the sheet body.

[0025] This arrangement prevents the sheet material between adjacent inner magnetic isolation grooves from being deformed and broken due to insufficient width.

[0026] Preferably, a plurality of the sheets are provided, the axes of the plurality of sheets coincide and fit together, and the installation angles of the plurality of sheets in the circumferential direction are staggered.

[0027] Through such a setting, the stability of the motor operation is improved and the noise during operation is reduced.

[0028] Compared with the existing technology, the present invention has achieved beneficial technical effects:

[0029] 1. The first permanent magnet and the second permanent magnet are respectively installed in the first magnet mounting groove and the second magnet mounting groove. The magnetic poles of the first permanent magnet and the second permanent magnet are arranged relative to each other, so that the first permanent magnet and the second permanent magnet attract each other on the sheet, thereby guiding the magnetic circuit to pass through the first permanent magnet and the second permanent magnet in sequence. The dispersed first permanent magnet and the second permanent magnet can guide the magnetic circuit to extend along the gap between the first magnetic isolation groove and the second magnetic isolation groove at different positions, reducing the eddy current loss generated in the rotor punching, reducing the radial magnetic force, and achieving the advantage of small eddy current loss of the permanent magnet.

[0030] 2. The first magnet mounting slot and the two second magnet mounting slots are arranged in a triangle, so that the first permanent magnet and the second permanent magnet cooperate with the first magnetic isolation slot, the second magnetic isolation slot, the first auxiliary slot, the second auxiliary slot and the third auxiliary slot, so that the Q-axis inductance of the motor is significantly greater than the D-axis inductance, and the magnetic resistance torque generated by the unequal inductance of the D and Q axes is fully utilized, the utilization rate of the first permanent magnet and the second permanent magnet is improved, and the area of ​​the motor's highest efficiency region is increased.

[0031] 3. By setting the first magnetic isolation slot, the second magnetic isolation slot, the first auxiliary slot, the second auxiliary slot and the third auxiliary slot, the magnetic circuit structure is optimized, the air gap magnetic field harmonics of the motor are reduced, the torque fluctuation and cogging torque are reduced, the leakage flux is reduced, and the maximum efficiency of the motor is improved.

[0032] 4. A triangular first magnetic isolation groove is set on the inner side of the sheet to reduce the leakage of magnetic flux to the motor rotor shaft installed at the center of the sheet, and the hollow structure formed by the first magnetic isolation groove can achieve the effect of ventilation and heat dissipation, thereby dissipating heat and cooling the sheet, the first permanent magnet and the second permanent magnet, reducing the temperature of the motor during operation, and reducing the weight of the sheet and the motor to achieve lightweight. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a structural schematic diagram of a built-in permanent magnet rotor punching sheet for improving the utilization rate of permanent magnets in an embodiment of the utility model;

[0034] Figure 2 This is a schematic structural diagram of the magnet installation structure in an embodiment of the present utility model;

[0035] Figure 3 It is a structural schematic diagram of the sheet body in the embodiment of the present utility model.

[0036] The technical features indicated by the reference numerals are as follows:

[0037] 10. Sheet; 20. Magnet mounting structure; 21. First magnet mounting slot; 22. Second magnet mounting slot; 23. First magnetic isolation slot; 24. Second magnetic isolation slot; 25. First auxiliary slot; 26. Second auxiliary slot; 27. Third auxiliary slot; 31. First radial magnetic isolation slot; 32. Second radial magnetic isolation slot; 33. Inner magnetic isolation slot; 41. First permanent magnet; 42. Second permanent magnet. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments, but the scope of protection claimed in the present invention is not limited to the following specific embodiments.

[0039] refer to Figure 1 and Figure 2 A built-in permanent magnet rotor lamination for improving permanent magnet utilization includes a lamination 10, which is a magnetic conductor. In this embodiment, lamination 11 is made of iron. Lamination 10 is provided with a magnet mounting structure 20. Magnet mounting structure 20 includes a first magnet mounting slot 21, two second magnet mounting slots 22, two first magnetic isolation slots 23, two second magnetic isolation slots 24, two first auxiliary slots 25, two second auxiliary slots 26, and two third auxiliary slots 27 located on lamination 10.

[0040] The two second magnet mounting slots 22 are located on the same side of the first magnet mounting slot 21. The two second magnet mounting slots 22 are symmetrically arranged with the first magnet mounting slot 21 as the center. The second magnet mounting slot 22 is tilted, and the end of the second magnet mounting slot 22 close to the center of the sheet 10 is tilted toward the direction close to the first mounting slot. The first magnetic isolation slot 23 and the second magnetic isolation slot 24 are respectively connected to the two ends of the second magnet mounting slot 22. The first magnetic isolation slot 23 and the second magnetic isolation slot 24 correspond to the second magnet mounting slot 22 one by one. The first magnetic isolation slot 23 is located at the end of the second magnet mounting slot 22 close to the center of the sheet 10, and the first magnetic isolation slot 23 extends toward the center of the sheet 10. The first magnetic isolation slot 23 extending toward the center of the sheet 10 can block the magnetic circuit of the two second permanent magnets 42 close to the center of the sheet 10, thereby reducing the eddy current loss generated at the end of the second magnet mounting slot 22 close to the center of the sheet 10.

[0041] The second magnetic isolation groove 24 is located at the end of the second magnet mounting groove 22 away from the center of the sheet 10, and extends circumferentially along the sheet 10. The second magnetic isolation groove 24, which extends axially toward the sheet 10, increases the distance between the magnetic path of the second permanent magnet 42 on the side of the sheet 10 that is closer to the center and the first permanent magnet 41, thereby blocking the magnetic path of the second permanent magnet 42 near the center of the sheet 10 from directly connecting to the first permanent magnet 41, thereby reducing magnetic leakage.

[0042] The two first auxiliary grooves 25 are respectively located at the two ends of the first magnet mounting groove 21, and the two first auxiliary grooves 25 are symmetrically arranged with the first magnet mounting groove 21 as the center. The first auxiliary grooves 25 at both ends of the first magnet mounting groove 21 can block the magnetic circuit at both ends of the first mounting groove, reduce the magnetic leakage of the first permanent magnet 41 at both ends of the first magnet mounting groove 21, and play a role in reducing magnetic leakage. The first auxiliary groove 25, the second auxiliary groove 26, and the third auxiliary groove 27 correspond one to one. The second auxiliary groove 26 is located on the side of the first auxiliary groove 25 away from the first magnet mounting groove 21, and the third auxiliary groove 27 is located on the side of the second auxiliary groove 26 away from the first magnet mounting groove 21. Through the arrangement of the second auxiliary groove 26 and the third auxiliary groove 27, the magnetic circuit at both ends of the first mounting groove can be further blocked, and the magnetic leakage of the first permanent magnet 41 at both ends of the first magnet mounting groove 21 can be reduced, thereby reducing magnetic leakage. The second auxiliary slot 26 is staggered with the connection line between the first auxiliary slot 25 and the third auxiliary slot 27 , so as to block magnetic paths in different directions at different positions, thereby further reducing magnetic leakage.

[0043] There are a plurality of magnet mounting structures 20, and the plurality of magnet mounting structures 20 are evenly distributed around the circumference of the sheet 10. By providing a plurality of magnet mounting structures 20, a plurality of permanent magnets can be installed, thereby improving the performance of the motor. The sheet 10 is provided with a plurality of first radial magnetic isolation grooves 31, and the first radial magnetic isolation grooves 31 are located between adjacent magnet mounting structures 20, and the first radial magnetic isolation grooves 31 extend in a direction close to the center position of the sheet 10. By providing the first radial magnetic isolation grooves 31, the magnetic circuit can be blocked between adjacent magnet mounting structures 20, while ensuring the structural reliability of the sheet 10, reducing the influence of the magnetic circuit between adjacent magnet mounting structures 20, playing a role in reducing magnetic leakage, and achieving the advantage of small eddy current loss of the permanent magnet. The sheet 10 is provided with a plurality of inner magnetic isolation grooves 33, which correspond one to one with the plurality of first radial magnetic isolation grooves 31. The inner magnetic isolation grooves 33 are located at one end of the first radial magnetic isolation grooves 31 close to the center of the sheet 10. The inner magnetic isolation grooves 33 are triangular in shape as a whole, and the width of the inner magnetic isolation grooves 33 gradually increases along the direction close to the center of the sheet 10. By setting the inner magnetic isolation grooves 33, the magnetic path of the magnet mounting structure 20 in the direction close to the center of the sheet 10 can be blocked, which plays a role in reducing magnetic leakage and achieving the advantage of small eddy current loss of the permanent magnet. The sheet 10 is provided with a plurality of second radial magnetic isolation grooves 32, which are respectively located between a plurality of adjacent inner magnetic isolation grooves 33, and the second radial magnetic isolation grooves 32 extend toward the center of the sheet 10. The second radial magnetic isolation grooves 32 are arranged between adjacent inner magnetic isolation grooves 33 to block the magnetic path between adjacent inner magnetic isolation grooves 33, thereby achieving the advantage of small eddy current loss of the permanent magnet. The second radial magnetic isolation grooves 32 extend toward the center of the sheet 10 , ensuring the structural reliability of the sheet 10 and preventing deformation and fracture of the sheet 10 due to insufficient material width between adjacent inner magnetic isolation grooves 33 .

[0044] refer to Figure 3 A plurality of sheets 10 are provided, the axes of the plurality of sheets 10 coincide and fit together, and the installation angles of the plurality of sheets 10 in the circumferential direction are staggered.

[0045] By comparing the electromagnetic force at 24 times the frequency between the punching sheet that uses the same permanent magnet and does not have the first magnetic isolation groove 23, the second magnetic isolation groove 24, the first auxiliary groove 25, the second auxiliary groove 26 and the third auxiliary groove 27 and the built-in permanent magnet rotor punching sheet that improves the utilization rate of the permanent magnet, it can be detected that the radial electromagnetic force of the punching sheet that does not have the first magnetic isolation groove 23, the second magnetic isolation groove 24, the first auxiliary groove 25, the second auxiliary groove 26 and the third auxiliary groove 27 reaches 47586N / m2, while the radial electromagnetic force of the built-in permanent magnet rotor punching sheet that improves the utilization rate of the permanent magnet is only 41846N / m2. Therefore, by setting the first magnetic isolation groove 23, the second magnetic isolation groove 24, the first auxiliary groove 25, the second auxiliary groove 26 and the third auxiliary groove 27, the radial electromagnetic force is reduced and the eddy current loss of the permanent magnet is reduced.

[0046] This embodiment has the following advantages:

[0047] The first permanent magnet 41 and the second permanent magnet 42 are respectively installed in the first magnet mounting groove 21 and the second magnet mounting groove 22. The magnetic poles of the first permanent magnet 41 and the second permanent magnet 42 are arranged relative to each other, so that the first permanent magnet 41 and the second permanent magnet 42 attract each other on the sheet 10, thereby guiding the magnetic circuit to pass through the first permanent magnet 41 and the second permanent magnet 42 in sequence. The dispersed first permanent magnet 41 and the second permanent magnet 42 can guide the magnetic circuit to extend along the gap between the first magnetic isolation groove 23 and the second magnetic isolation groove 24 at different positions, reducing the eddy current loss generated in the rotor punching, reducing the radial magnetic force, achieving the advantage of small eddy current loss of the permanent magnet, and effectively improving the utilization rate of the permanent magnet.

[0048] The first magnet mounting slot 21 and the two second magnet mounting slots 22 are arranged in a triangle, so that the first permanent magnet 41 and the second permanent magnet 42 cooperate with the first magnetic isolation slot 23, the second magnetic isolation slot 24, the first auxiliary slot 25, the second auxiliary slot 26 and the third auxiliary slot 27, so that the Q-axis inductance of the motor is significantly greater than the D-axis inductance, fully utilizing the magnetic resistance torque generated by the unequal inductances of the D and Q axes, improving the utilization rate of the first permanent magnet 41 and the second permanent magnet 42, and increasing the area of ​​the motor's highest efficiency region.

[0049] By setting the first magnetic isolation slot 23, the second magnetic isolation slot 24, the first auxiliary slot 25, the second auxiliary slot 26 and the third auxiliary slot 27, the magnetic circuit structure is optimized, the air gap magnetic field harmonics of the motor are reduced, the torque fluctuation and the cogging torque are reduced, the leakage flux is reduced, and the maximum efficiency of the motor is improved.

[0050] The two second magnet mounting grooves 22 are symmetrically arranged, which makes the structure of the sheet 10 simple. Second permanent magnets 42 of the same size can be installed in the two second magnet mounting grooves 22. The permanent magnet assembly process is relatively simple and convenient for production and assembly.

[0051] A triangular first magnetic isolation groove 23 is provided on the inner side of the sheet 10 to reduce magnetic flux leakage to the motor rotor shaft installed at the center of the sheet 10, and the hollow structure formed by the first magnetic isolation groove 23 can achieve the effect of ventilation and heat dissipation, thereby dissipating heat and cooling the sheet 10, the first permanent magnet 41 and the second permanent magnet 42, thereby reducing the temperature of the motor during operation, and reducing the weight of the sheet 10 and the motor to achieve lightweighting.

[0052] Permanent magnets are installed on multiple circumferentially staggered sheets 10, so that when the built-in permanent magnet rotor punching that improves the utilization rate of permanent magnets rotates to different angles, different sheets 10 can be driven to rotate by the magnetic field, so that they can be driven by the magnetic field when rotating to different angles, thereby improving the stability of the motor operation and reducing the noise during operation.

[0053] Based on the disclosure and teachings of the above description, those skilled in the art may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and modifications and variations of the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although certain specific terms are used in this description, these terms are for convenience only and do not constitute any limitation on the present invention.

Claims

1. A built-in permanent magnet rotor punching sheet for improving permanent magnet utilization, characterized in that: The invention comprises a sheet (10), wherein the sheet (10) is provided with a magnet mounting structure (20), wherein the magnet mounting structure (20) comprises a first magnet mounting groove (21) and two second magnet mounting grooves (22), two first magnetic isolation grooves (23) and two second magnetic isolation grooves (24) located on the sheet (10), wherein the two second magnet mounting grooves (22) are located on the same side of the first magnet mounting groove (21), and the two second magnet mounting grooves (22) are symmetrically arranged with the first magnet mounting groove (21) as the center, the second magnet mounting groove (22) is tilted, and the end of the second magnet mounting groove (22) close to the center position of the sheet (10) is tilted in the direction close to the first mounting groove, the first magnetic isolation groove (23) and the second magnetic isolation groove (24) are respectively connected to the two ends of the second magnet mounting groove (22), and the first magnetic isolation groove (23) and the second magnetic isolation groove (24) respectively correspond to the second magnet mounting groove (22).

2. The internal permanent magnet rotor punching sheet for improving permanent magnet utilization according to claim 1, characterized in that: The first magnetic isolation groove (23) is located at one end of the second magnet installation groove (22) close to the center of the sheet (10), and the first magnetic isolation groove (23) extends toward the center of the sheet (10).

3. The internal permanent magnet rotor punching sheet for improving permanent magnet utilization according to claim 1, characterized in that: The second magnetic isolation groove (24) is located at one end of the second magnet mounting groove (22) away from the center of the sheet body (10), and the second magnetic isolation groove (24) extends along the circumference of the sheet body (10).

4. The internal permanent magnet rotor punching sheet for improving permanent magnet utilization according to claim 1, characterized in that: The magnet mounting structure (20) further comprises two first auxiliary grooves (25) arranged on the sheet body (10), the two first auxiliary grooves (25) being respectively located at two ends of the first magnet mounting groove (21), and the two first auxiliary grooves (25) being symmetrically arranged with the first magnet mounting groove (21) as the center.

5. The internal permanent magnet rotor punching sheet for improving permanent magnet utilization according to claim 4, characterized in that: The magnet mounting structure (20) further comprises two second auxiliary grooves (26) arranged on the sheet body (10) and two third auxiliary grooves (27) arranged on the sheet body (10), wherein the first auxiliary groove (25), the second auxiliary groove (26) and the third auxiliary groove (27) correspond to each other one by one, the second auxiliary groove (26) is located on a side of the first auxiliary groove (25) away from the first magnet mounting groove (21), and the third auxiliary groove (27) is located on a side of the second auxiliary groove (26) away from the first magnet mounting groove (21), and the second auxiliary groove (26) is staggered with a line connecting the first auxiliary groove (25) and the third auxiliary groove (27).

6. The internal permanent magnet rotor punching sheet for improving permanent magnet utilization according to claim 1, characterized in that: A plurality of the magnet mounting structures (20) are provided, and the plurality of magnet mounting structures (20) are evenly distributed around the circumference of the sheet (10).

7. The internal permanent magnet rotor punching sheet for improving permanent magnet utilization according to claim 6, characterized in that: The sheet body (10) is provided with a plurality of first radial magnetic isolation grooves (31), wherein the first radial magnetic isolation grooves (31) are located between adjacent magnet mounting structures (20), and the first radial magnetic isolation grooves (31) extend in a direction close to the center position of the sheet body (10).

8. The internal permanent magnet rotor punching sheet for improving permanent magnet utilization according to claim 7, characterized in that: The sheet body (10) is provided with a plurality of inner magnetic isolation grooves (33), and the plurality of inner magnetic isolation grooves (33) correspond one to one with the plurality of first radial magnetic isolation grooves (31). The inner magnetic isolation grooves (33) are located at one end of the first radial magnetic isolation grooves (31) close to the center of the sheet body (10). The inner magnetic isolation grooves (33) are triangular in shape as a whole, and the width of the inner magnetic isolation grooves (33) gradually increases along the direction close to the center of the sheet body (10).

9. The internal permanent magnet rotor punching sheet for improving permanent magnet utilization according to claim 8, characterized in that: The sheet body (10) is provided with a plurality of second radial magnetic isolation grooves (32), the plurality of second radial magnetic isolation grooves (32) are respectively located between a plurality of adjacent inner magnetic isolation grooves (33), and the second radial magnetic isolation grooves (32) extend toward the center of the sheet body (10).

10. The internal permanent magnet rotor punching sheet for improving permanent magnet utilization according to claim 1, characterized in that: A plurality of the sheet bodies (10) are provided, the axes of the plurality of sheet bodies (10) coincide and fit together, and the installation angles of the plurality of sheet bodies (10) in the circumferential direction are staggered.

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